Qualified subjects will be screened and upon fulfilling inclusion/exclusion criteria and signing the informed consent will be enrolled in the study and enter the randomization phase (2-30 days). Subjects will be randomized according to a sealed allocation list that will be balanced for sequence and provided to each site prior to the first subject enrollment. Subjects that withdraw prior to completing the third period will be replaced in a randomized manner. The randomization list will be generated by the study statistical group. There are six test periods in three sequences for a sequence-randomized study. During two test periods subjects will receive a single dose of the brand AED and during the other four test periods subjects will receive a single dose from one of the two investigated generics (each twice). The single doses will be administered in the fasting state during an in-facility 12-hour pharmacokinetic session to collect samples to determine Cmax and AUCs. Four additional samples will be drawn at 24, 48, 72, and 96 hours after the dose as an outpatient (making each pharmacokinetic test last for 4 days). Each in-facility pharmacokinetic testing will be separated by a 12-23 day washout period; consistent washout periods of 14 days will be preferred. A final follow-up phone evaluation will be conducted 12-16 days (target 14 days) after the last dose. During the study the subjects will continue their usual concomitant medications, including AEDs, without change.